Annealing-furnace



(No Model.) 3 sheets-sheen.

P. BALDT.

ANNBALING PURNAGB.

No. 250,702. Patented Deo.13,18 81.

Ww WW n (No Model.) 3 Sheets-Sheet 2.

P. BALDT.

ANNEALING FURNAGB. N0. 250,702. Patented DeG.13,1881.. jig. a I| l (N oModel.)

3 Sheets-Sheet 3'. F. BALDT.

ANNBALING PURNAGB.

Patented Deo. 1 3,y 1881.

N. Pneus. mammography. wnshingm". n. c.

UNITED raras PATENT OFFICE.

FREDERICK BALDT, OF CHESTER, PENNSYLVANIA. i

ANNEALlNG-FURNACE.

SPECIFICATION forming part of Letters Patent N0. 250,702, dated December13, 1881.

Application filed May 14, 1881. (No model.)

To alt whom it may concern:

Be it known lthat 1, FREDERICK BALDT, a citizen of the United States,residing at Chester, in the county of Delaware and State ofPennsylvania, have invented certain new and useful Improvements inAnnealing-Furnaces; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame,reference being had to the accompanying drawings, and to letters oriigures of reference marked thereon, which form a part ofthisspecitication.

My invention relates to furnaces for annealing steel or malleable-ironcastings; and its object is to construct a furnace with sectionalannealing-pans in such a manner that the sections ot' the pans will beself-sustaining when the furnace is unpacked, and also to construct andarrange said pans so that the whole interior space otl the furnace canbe utilized.

Another feature of the invention aims to secure tight joints around thedoors by the use of a luting or mud joint around the sides and ends ofthe furnace-doors, said doors being made a little smaller than theopenings and hung so as to extend inside of the door-casing.

The invention will first be fully described in connection with thedrawings, and then clearly set forth in the claims.

In the drawings, Figure 1 is a vertical sectional elevation of adownward-draft annealing-furnace embodying my invention. Fig. 2 is afront elevation thereof, showing the manner of fitting and packing thedoors of the annealing-chamber. Fig. 3 is a detail View of one of thepan-sections. Fig. 4. is a vertical sectional elevation of anupward-draft furnace embodying my invention.

The letter A designates the masonry-work of a square annealing-furnace,which has the customary fire-chambers B and ash-pits G locatedin itsside walls. Flues made in the side walls convey the heat and products ofcombustion into the annealing-chamber D. The side walls of this chamberslope outward; or, in other words, the width ofthe annealing-chambergradually increases from the door to the crown. Notched or aperturedpiers E, forming part of the masonry-work of the walls, or

otherwise permanently secured thereto, support the side sections ofsectional annealingpans F. These pans are constructed with detachablebottom, side, and end sections, whereby l obtain advantages notpossessed by the ordinary boxes or rings generally employed. The bottomof the lower pan rests upon the short pillars or blocks G which risefrom the furnace-Hoor, so as to form a space between it and the pan forthe circulation ot' the products of combustion. The side panels of thesectional pans rest against the notched pillars of the sloping sideWalls, these pillars being so arranged that vertical spaces are leftbetween said side walls and the sides of the annealingpans for the freecirculation of the products of combustion or heated gases from thefurnaces.

The bottom section of the lower annealingpan rests upon the blocks G, asalready stated, and extends the full length of the furnacechamber. Thisbottom is provided or formed with projecting end ledges or anges, a,which,

in connection with inwardly-projectin g ledgesv or lianges b, formed onthe ends ofthe side sections ofthe pans, serve to hold in position theloose or detachable end panels of the sectional pans. The lower ends ofthe ledges of the side sections also project below the end of the bottomsection, so as to lock the various parts of the pans firmly together.

Instead of the ledges or flanges being both on the bottom and sidesections, suitable stops or projections may be formed or applied eitherto the side or bottom sections, for the purpose of holding the endpieces in position while packing the castings in the pans.

It will readily be observed that by construct- I ing the annealing-pansin sections, as shown, the whole interior space ot' the furnace-chamberis occupied thereby, which is not the case with the ordinary superposedpots or rings. The sloping side Walls and notched piers effectuallysupport the various pan-sections, and the latter being inclined outwardcannot fall in when the furnace is unpacked.

The ends of the furnace or annealing-chamber are closed by doors M.These doors are hinged to the door jam or frame in such a manner, andare of such a size that a space is left between the adjacent edges ofeach pair of IOO doors, and also between all the edges adjoinin gthedoor-casing. The doors also are hinged so as to enterinto thedoor-opening when theyl are closed. The spaces left between the adjacentedges of the doors and between the doors and furnace-walls are filledwith clay or other lutin g, N, so as to make a perfect air-ti ght jointbetween said doors and furnace.

In the form of furnace illustrated in Figs. 1 and 2 the products ofcombustion pass to the top of the annealing-chamber, and then theycirculate in a downward direction around the pan and pass out throughopenings in the tloor of the annealingchamber, which openingscommunicate with a iiue leading to the chimney.

In the construction of furnace shown in Fig. 4 the rechambers arelocated below the annealing-chamber, and the products of coinbus tionenter the latter through openings in the Hoor thereof. In the presentinstance an upward circulation or passage of the products of combustiontakes place, and a chimney is arranged above the furnace, as is shown inthe drawings.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

' 1. An annealing-furnace having outwardlysloping interior side walls,or a chamber made wider at the top than at the bottom, in combinationwith sectional annealing-pans resting against said side walls,substantiallyr as herein set forth.

2. An annealing-furnace having outwardlyinclined interior piers orsupports, in combination with sectional annealing pans resting againstand supported by said piers or supports, substantially as and for thepurpose set forth.

3. Sectional annealing-pans formed of detachable bottom, side, and endpieces, locked together by an ges or projections formed thereon,substantially as herein set forth.

4. An'annealing-furnace having sloping interior side walls and notchedpillars arranged thereon,in combination with sectional annealing-pans,as and for the purpose set forth.

In testimony whereof I afx my signature in presence ot' two witnesses.

FREDK. BALDT.

Witnesses:

J osEPrr ENTWisLE, J. B. ALLEN.

